Very simple bash question

dcc24 · 2010-02-09 21:23:32

I don't know how to use sed etc. so I thought someone who knows bash scripting can help me. The following is the command I execute and it's output:

$ aticonfig --adapter=0 --od-gettemperature

Adapter 0 - ATI Mobility Radeon HD 4300 Series
            Sensor 0: Temperature - 58.50 C

Now I need a script (preferably a one-liner) that will return 58.50 (the temperature) from the above output.

Any help is much appreciated.

xstaticxgpx · 2010-02-09 21:36:36

aticonfig --adapter=0 --od-gettemperature | tail -n1 | gawk '{ printf $5 }'

dcc24 · 2010-02-09 21:39:33

Great thank you!

If you don't mind, can you explain how does this work?

Cyrusm · 2010-02-09 21:42:56

another way that should work

aticonfig --adapter=0 --od-gettemperature | egrep -o [0-9][0-9]\.[0-9][0-9]

skanky · 2010-02-09 21:47:11

Don't mean to be awkward, but here's an alternative:

aticonfig --adapter=0 --od-gettemperature | awk '/^ +.*/ {print $5}'

Extra regex vs extra subshell. ymmv.

Edit: I hadn't seen Cyrusm's so my last line probably doesn't make sense.

Last edited by skanky (2010-02-09 21:51:46)

dcc24 · 2010-02-09 21:48:57

Guys, they are all great and everything, but I still don't understand how any of them actually works. Care to explain?

skanky · 2010-02-09 21:50:24

dcc24 wrote:

Great thank you!
If you don't mind, can you explain how does this work?

1) pipes via tail which returns the last line, and pipes that through gawk, which prints the 5th field - space separated.
2) Pipes via grep which returns the text anywhere in the output that matches "digitdigit.digitdigit"
3) Pipes via awk which returns the 5th field (space separated) of the line that starts with a space.

There are also other ways of doing it.

dcc24 · 2010-02-09 21:52:55

Great, thanks!

briest · 2010-02-09 23:09:56

Hey, what about

aticonfig --adapter=0 --od-gettemperature | awk 'END{print $5}'

? No extra regex

majiq · 2010-02-10 03:33:50

No need to stay away from sed though. Better to learn it eventually:

aticonfig --adapter=0 --od-gettemperature | sed -n -e '/Temperature/s/^.* - //;s/ C.*$//p'

What that says is take the output, don't automatically print the line [-n], then apply the following filter [-e]:
1. find the line with temperature (/Temperature/),
2. Remove everything up until the " - " [s/^.* - //]
3. Remove everything after the " C" [s/ C.*$//]
4. Print the resulting line [p]

Somewhat more painful, but it could be worse. :-)

skanky · 2010-02-10 10:54:23

briest wrote:

Hey, what about
aticonfig --adapter=0 --od-gettemperature | awk 'END{print $5}'
? No extra regex

Nice one. I'd forgotten about that little foible.

Arch Linux

#1 2010-02-09 21:23:32

Very simple bash question

#2 2010-02-09 21:36:36

Re: Very simple bash question

#3 2010-02-09 21:39:33

Re: Very simple bash question

#4 2010-02-09 21:42:56

Re: Very simple bash question

#5 2010-02-09 21:47:11

Re: Very simple bash question

#6 2010-02-09 21:48:57

Re: Very simple bash question

#7 2010-02-09 21:50:24

Re: Very simple bash question

#8 2010-02-09 21:52:55

Re: Very simple bash question

#9 2010-02-09 23:09:56

Re: Very simple bash question

#10 2010-02-10 03:33:50

Re: Very simple bash question

#11 2010-02-10 10:54:23

Re: Very simple bash question

Board footer